Do I need sledding experience for the sunset tour?

You don't need sledding experience. Before the start, the guide gives a safety briefing and shows you how to steer, brake, and take corners. People who've never been on a sled manage well. The track is more demanding than a park slope because it's longer and partly ridden in twilight. The guide stays with the group and adjusts the pace to the participants. Basic fitness and mobility are required.